Polychromatic pad for use in color photography



April 1942- F. G. YANES' 2,280,112

POLYCHROMATIC -PAD FOR USE IN COLOR PHOTOGRAPHY [ori inal Filed July 15,1957 part records in whichgcolors belonging; to an end oi the spectrumappeandistributed among' Patented Apri 21, 1942 a e UNITED STATES PATENTOFFICE ronrcnaom'rrc no son USE In coma rno'roc Francisco G. YaneuNewYork, N. Y., assignor,

by direct and mesne assignments, oi thirty per cent to Tomas Paoanins,New York, N. 1., and fliteen per cent to Florencio Gomea, Trujillo.City, Dominican ltepllbllc application July 15,

1931, Serial No.

r 153,696. Divided and this application November23,1938, No. 241,986 i ia 11 Claims. (01. 101- 149) The invention relates alight insensitive dryj element, whichmay be described as a support coated with a medium-inwhich color providing substances are incorporated, proportioned andprearranged for photographic pu ses.

V The inventionwas iirst the subject of an ap-:

plication Serial No. 153,696, iiled on July/1511937,

of whichthe presentpne is a division. Injthe original application theinvention was given thetitle oi Polychromatic pad to diiierentiate itfrom the Tonochromatlc film, anothermaterial sensitiveto-lightwhichwasthe subject oi another application, also illed on July 15; 1 93.7. underserial;

No.153,695. n i p p y poly/chromatic pad oi the present invene tion maybe considered irom-two diiierent points oi view according tothe;coloryphotographicpurposes attainedr It vmay be used for selectivelyj dyeing or inking part images indii'ierent processes as a substitute ofcoloring baths. and it mayyalso be used as a picture ioundation when thecolors present in the pad are eliminated proportionally .tO-the negativecolor values. In both casesthe pad may render monochromatic part, imagesor the tone valuesoi a partimage for purp ses concerning specifi-processes.-

One oi the oithelnvention is to'eliminate the useoi dyeing'baths andtoprovide color" ingmeans which can supply the necessary amount oidyeing liquor at the required moment ,with economy, simplicity,cleanness and especially with constant results. Indye printingand:ingeneral inmost coloring processes, every colorrequires a special,solution, or rather a set oi solutionsoi diflerent saturation, or acidor alkaline content in order-to provide diiierent degrees oiqcontrastyThe number r dyeing bathsis then multiplied by the number oi colorsrequired for two, three or iour color work Thenthose baths must be wellpreserved and, stored in a number oi containers and also maintained incondition from poses, The. pad, in'thejiir'st, place is a drymat'e'rlal,nmmm a; photographic film instructure. and which can be cut todiiierentsizes. stored in a small place, a'ndavailable ior use at ingood condition without special precautions and indefinitely. .Bycarrying only the necessary amount oi coloring substances for one imagethe pad i s/susceptible oi rendering constant'results Q asa'" new one isused-every time. Such amount 1 cicoloring mattermay be varied iorcliflerent contrastsand for diiier'ent colors and may also be chosen astosupply complementary colors, requirements which-are easily controlledin, the

10 manuiacture oi the pad. As to the. acid or al-,

kaline content that the dyeing liquor may require item be easilyproportioned when the pad is -wetted"at the moment oi using.

Another advantage oi the pad over coloring 1,5 baths is thepossibilityof a mass production-namally limited by the number or size not tanks andtrays, for anynumber of part images can be simultaneously colored. 1

Another advantage is that the pad may be produced as a double coatedelement lh'aving a ditierent pigmen't on each side which permits asimultaneous and selective coloring of two records oi diiierent colorvalues. simply by sandwiching betweenthem the wetted pad, an arrangementmost suitableior two color work. p

the cleanness oi the operationwhen the coloring is. applied by Stillanother advantage 'is means of the pad because the pigments which arenot taken by the colored image remainin so the pad and there is'not anyrunning of staining solutions, an advantage which is I priceless irommany points oi view. i a

p Although the'opportunity oi finding a manner for choosing,proportioning and maintainingthe standard oi the coloring together, withthe sim-' pliflcation oi dyeing outfit was enough to iustiiythejchromatic pad, that idea was 'only the point oi departure fordeveloping my inventioninto a dyeing element susceptible oi supplyingmore 40 than one color under controllable conditions. I

iound that migrating colors held'in sup rposed layers, provided therewere not a great difference in their respective rate of penetration,behave as a single color and transferred in order. to the point ofmaking feasibleto give a diflerent'coloring to the light andheavy tones0! a dye receptiv'e image respectively. v Yet while investigating thepossibility 01' introducing an element of certainty in the application 5of two colors, or rather a graded combination of two colors to the sameimage, I stiilgound that bvusing the pad asa picture ioundation and idischarging mm it thenegative valueseit was possible to obtain a sharpimage in which the any time. As it is not sensitive to light it keeps5.) Propor i n nd dis ribution oi said colors was 7 controllable byvarying the thickness and color saturation of the strata in apolychromatic pad.

The novel constitution and operation of the coloring pad of theinvention may be easily understood by comparison with the generaltechnique of dyeing. In the tinctorial industry, after the-coloringliquid is prepared and the material to becolored immersed in thesolution, the first step is to cause the pigment to move from the liquidto the material where itis deposited. According to the class ofdyestuif, the material to be colored and the use for which the last ispurported, some after treatments-maybe necessary or not to,flx thecolor. In some instance the aflinity for the dyestuii is previouslycreated by mordanting the material and in some other cases both thedeposition of the pigment and its adsorption are produced by the processof dyeing. Usually the last result is achieved by raising thetemperature of the coloring bath to help the decomposition of thedye-salt whose coloring component is not soluble in the bath and becomesdepostied. Such raising of temperature also changes in some instancesthe electrical charge of the material and creates in it a greateraflinity for the reverseiy charged dye-ions. But whatever b ethe case,the dyeing process may be summarized in two steps: (1) To cause thedyeing matter'to move from the dyeing liquid to the body subjected tocoloring. (2) To fix the color in thatbody when necessary. 0n the otherhand. the great variety of dyestuffs and their different solubility,going from those that become hydrolyzed in the cold by water alone tothose which are insoluble in water and cannot be used in direct dyeing,creates another problem in the fundamental step of causing the dyeingmatter to hedeposited. Such problem is the rate of deposition of thepigment, for when it is too rapid amounts to a precipitate and givespatchy results, and when too slow doe not satisfy practical purposes;This situation is controlled by the use of assistants whose function isto accelerate or to retard the rate of deposition of the pigments.

When the general technique of dyeing i 'applied to the coloring ofphotographic records the dyeing resources are somewhat reduced becausethe raising of temperature is not advisable. For

that reason pigments known to the art have been chosen which canbeeasily controlled in the cold by assistants. Among these assistantssome are of purely mechanical action, as inert salts or' colloids addedtothicken the dyeing liquor, and r some others of chemical or electricaleffect, among which acids and alkalis that increase or decrease thesolubility of the dyestufi in the bath. When using acid or mordant-aciddyes which as a rule are readily soluble in water, 'a small amount of aweak acid decreases th solubility and increases the rate of deposition.Some acid dyes, however, which are not very soluble, are deposited froma neutral bath, and still some, whose solubility is still less, need aweak alkaline assistant. Basic dyes, on the other hand, act in a reverseway for they, are hardly soluble in water and a small amount of' acidfavors their solubility in the bath'and acts as a retarder. For directdyes, which have been compared to colloidal solutions in which thepigment is suspended, the assistants are purported to increase ordecrease the size or the colloidal aggregates of coloring matter, or asa physical obstacle to their. rapid deposition. The viscosity ofcolloidal solutions ticularly undesirable for colors must be obtained 1commonly known and used in the tinctorial industry as a retarder for thepenetration of coloring liquids is also utilized in the coloring ofcertain kinds of photographic records.

From the last point of view, there is a substantial difference with thepad of my invention. When starch, gelatine, glue and similar substancesare utilized as protecting or retarding substances in the tinctorialindustry, their eifect is to increase the viscosity of the bath, a longas gelatine in a hot water solution is dissolved and acts asany othersoluble colloid. When coloring certain typesof photographic records inthe cold, the thickening of the bath is actually performed only by meansof soluble colloids. In the pad of the invention, however, as laterdescribed, a setting colloid is mixed with the coloring solution andthen coated and dried. As the coating sets the coloring bath remainsfluid swelling the colloid. When dry. the solid components of thecoloring bath are only retained by the coating; but when the pad issoaked in water for using, the original dyeing liquor is restored andheld by a swollen coating which is not soluble in water and can supplythe coloring by contact to a photographic record. Such achievement ispossible because a jelly is utilized as a retarder and makes unnecessarythe agitation of the liquor, as we shall demonstrate.

When a coloring bath is repeatedly used there are many known resourcesfor refilling it in order.

to produce approximate results, but the coloring process is still toocomplex to expect precise and constant shades. In the case of coloringphotographic records such lack of precision is parcorresponding to agiven contrast and sometimes in complementary relation with colorsproduced by other baths. The only manner of obtaining constant resultsis by using each time new and freshly'prepared coloring liquids, acourse involving waste, for the bulk of the liquor sometimes must besufllcient for handling lengths-of film, as in cinematography. Even in asmall scale the amount of solution must permit the agitation orcirculation of the bath.

While experimenting in coloring photographic wash-oil. matrices byspreading upon the records small amounts of new coloring baths I foundthat.

acid and mordant-acid dyes were not suitable for that purpose unless thedyeing solution were agitated by moving the records or by blowing airupon them. Otherwise the coloring was uneven and marble-vein marksappeared on th image. By watching how the blowing upon the recorddisturbed the formation of the' marble-vein marks I realized that it wasa retarding action which could be substitutedby another physicalretarder. Thus instead of applying the small amount of coloring solutiondirectly, I held the liquid in a gelatine layer and applied the same bycontact. The result was a somewhat slower'but perfectly even coloring.The idea of producing a dry pad carrying the solid components of adyeing bath, was the practical consequence, for the amount of water thata given weight or gelatine is capable of absorbing is known, and so theconcentration and dyeing power of a pad may be also known, controlledand standardized in manufacture.

It has been suggested to apply dyeing solution by means ofspongeousbodies holding the free liquid, but outside of those dyes which maycolor from a standing bath, the retarding action of the agitation of theliquid will be absent the coloring uneven. Another possible troublewhenusing a. color dispenser of that type conand sists in the airbubblescaught between thesponge 1 and' the record; which cannot beeliminated'bysqueegeeing without the liquidrunnlng outxof the spongex ln the case ofthe gelatinecoating,

on the contrary, the contact may be produced by imbibed in acoloringsolutionrand dried could squeegeeing and is perfect. :Aspongeous body notbe immersed in a liquid without. giving away ithejpigmentst In. fact, a. devicexof this sort is" purported to appiy acoloringzliquid previously.-

preparedxwhiie the pad, itself, is a dyeing bath in dry condition,advantageously held in a container which automatically takes thenecessary amountof waterto later furnish the coloring matterby contact,at asconvenient rate and for precise and constant results; v s q VBesides its retarding action during the coloring process, the imbibedcolloid has in: regard to dyestuii's the quality of retarding .also therate of bleedingf A dry Igelatine layer, .for instance, carryingacrystallized water soluble salt will give away thatsubstancewhenwimmersed .in a

plied at ordinary emulsion coating temperature 0133' to centigrade. Forpurposes later described hard'gelatine is preferable and. should thesaturation of the color be too great it may be cut by adding moregelatine. L Ihetemperature shouldnever be raised further :than necessaryfor mixing orcoating as it may aflect some dyes. I usually add smallamounts of glycerine to preventthe'brittleness of the coating. Insteadof Celluloid the support may be made of collodion, and many othersuitable materials ini cludinga self supporting medium; andregarding'the medium other colloids or matter fulfilling the purpose maybe .used. The color-causing substances are, also many and may beincorsidering 'that. it is not a mere color dispenser, for

water solution, while the same. coating will take a longer time togiveupatpigment and when small amounts ofwknown assistants are added tothewater the bleeding mayi be completely stopped. This is a favorablecondition for the known assistants which may be necessary to combinewiththe dyestuiiin a coloring pad! should rather be purported to prevent theadsor'ption. of the pigmentwb'ylthe gelatine which must later supply thepigment by-contact the.

1 record. The factthat the soaking solution prevents the bleeding of :asubstantially free-pigmen't shows that useful property of the colloid.

complementary colors of the required shade may be chosen,proportioned-and prearranged to permit the correctand simultaneousdyeing of two matrices. I do that by sandwiching between 3 them, atmoderate pressure, the color-supplying Thus the pigment held,bythefiswollen coating remainsina sort of equilibrium between thecolloid for which it has no aflinity and the liquid in which it is-lesssolublep when the wet pad is oredthe migration starts and continues bydiffusion, undoubtedly accelerated by the present humidity but withoutany running coloring bath. In this manner the first step of the coloringprocthe final image or an' inked ,matrix purported to be printedon athird element, and ,when necessary it may be performedin-any -ofthewayswell knowntotheart; f i u Inthedrawing'r i a Fig. 1 illustrates abicolor pad.

Fig. 2 is thefour color-tonochromatic form of amped.-

g FigQB-shows a three color type of pad. i 1 mg. 4 "presents element." mN A very simple form of a bicolor pad is illustrated in Fig. 1. Itcomprises a support S carrying two coatings of a medium in which twomi-.

kindof dyestuffs which will migrate or wander" into "another, gelatinehim, a property; correwhich tan be increased or; controlled in mostplained. is susceptibleof being manulactured to dyestuffs byfjthefaddition of I "assistants well mownm thcltinctorial industry.

I may prod be the dyeing element in a support of. Celluloidand'use asamediunr geiatinewhich is previously dyed to the desired shade-andapapplied and squeegecd on the'record to be coless i performed. As 'tothe fixing of the "color all depends upon whetherithe colored record iselement previously soaked in water in the presence of an assistant whichprevents the bleeding of the. colors, asfor instance, a slight amount'of a weak acid for certain groups of dyestuffs. A further advantage of'the dyeing element is that the colorscan be;proportionate for the heavytones, and once the equilibrium of the coloring is producedior thelighter tones, the heavy 'ones carmot takemore color than is present inthesec- "tion. they contact, so it is possible to control the contrast.It is evident :that by proportioning the coloring substances to theweight of the gelatine they are consequently proportioned to the amountof water that the gelatine is capable of absorbing, which is aknown-factonandso not only the volume but the concentration and dyeingpower of the coloring liquid therein produced is knownand controllable.Of, course the proporsuch form-they also maybe used for final coloringof a transparency whose complementalvalues are produced on oppositesides of a double coated by means of the element shown inFig. 1, leaves-this, afterused, without any furtheriapplica-r the, pad as apotentialdyeing tion. However, this waste is avoided when the material is used asa foundation for thepicture. I' may produce through the photographicprocess instead of positive reliefs reversed or negative absorbentimages which when dyed by the element will leave in this the positivecolor picture. And, as long as said negative matrices can be washed andused again many copies can be re- I s produced. So the dyeing elementhas both the sponding to thesolubillty ofthe dye in water and advantagesof a controllable dyeing. device and a sort of chromatic foundation, forthe produc duced by discharge, I may add a feature shown in Y whichseparates the support from the orange layer 2 and the blue-greenlayer 3.The same stratum carrying a dye repellent colorless saltwhich as themigration takes place seems to niove of this substratum is ratherphysical, many dyeing assistants 'well known inthe industry can be usedin a small proportion according to the class oidyestufl.Anotherprecaution when using the element. as picture -foundation is toadd to the soaking solution a hardening-substance as 1 to 2%formaldehyde for instance. After the discharge takes place the film mustbe quickly dried. As it is, the material in Fig. 1 might be used incinematography for two-color pictures and even the amateur will beoflered the easiest and most economic-way of producing a colorphotograph. Athin sheet of the double coated material formed ona thinand flexible support may be soaked and sandwiched between the twonegatives in register set must be proportionate for the requiredcontrast and so balanced in regard to each other that theircomplementary combined absorption inthe. line of absorptio Although thefunction produce a neutral gray.

Whether the pad be used as a dyeing element,

including the inking or final coloring of photographic records, or as apicture foundation when this is produced by discharging negative valuesfrom the pad, the migration of coloring substances from the pad towardsthe photographic record may be produced in many ways by well knowntreatments. Aphysical phenomenon or chemical reaction or both combined,may cause mordanted, absorbent or both mordanted and absorbent recordsto have an affinity for coloring solutions. Inregard to the relativethickness of the layers in certain types of the pad, suchmaterialization has been adopted to show proportion, but such proportionmay be realized by other means; Another point is that the migration-isnot an exclusive property of certain dyestufls, for many substancessusceptible of rendering a color by chemical reactionmay be subjected todischarge and are equivalent to coloring substances.

In regard to the specific types of pads illus trated in the drawing theymust be considered oi'a-bi-pack transformed in absorbent .dye-discharginimages. r

Although reference, has been made to the coapplication describing thetonochromatic film, I shall here summarize the'main points of thepotential poiychromatic prearrangement duplicated in Fig. 2. One side ofthetransparent support S carries a thin yellow coating 1 and a magentathicker layerl; this pair transmits a strong red, but if color isdischarged, in depth lighter reds, oranges and yellows maybe producedshowing a pigmentary imitation of one end of the spectrum.

. The pair blue-violet 6 and green 8 on the other side it subjected tosimilar discharges will re rct -duce another complemental section oi-thespec- It can be easily understood that a negative photographic relief ofgelatine, having a varied abmrbing' capacity according to the. tones,will mak proportional discharges on each side. And as the two-elementanalysis according to the tqncchromatic system have been arranged toseparate. the two scales oi colors and adjusted-to record themin thesame spectral order adopted in'the material, a full color picture willbe ob- Instead-oi having four strata, the pad may be built asin Fig. 3,where a single blue-green stratum II is opposite to' the pairmagenta-yellow lt-IL: Or as in Fig. 1, where both pairs are representedby' intermediate colors as c the orange 2 and the blue-green 3. g whenthe pad is used for dye ma oneside coated element may be used as showninF18. 4. Although it may be produced .to supply one color it beenillustrated for doubles-coloring and the order of the strata ll-ltisreversed. 'Assumlng that an absorbent positive image is produced on asupport. and put in contact with the wet dyeing element, the lightertones will only take the yellow while the other color'willbe absorbedtogether with the yellow and proportionthe polyehromatic pad for thecolors for each as different examples of arrangements purported to servedifferent processes of the prior art. In said examples a pad may have asupport as in Fig. 4 and supply two colors. or it may supply one colorand have acommon support with another pad supplying also one color as inFig. l, or supplying .two' colors as in Fig. 3. So the pad may supply acolor or two and have either an individual or common support withanother pad. In pajds supplying two colors the position of the layers inregard to the support, for dyeing purposes, as shown in Fig. 4, ischanged into a reversed arrangement when the pad is to be used for apicture foundation by discharging the negative values, as shown in Fig.2, though the material in both cases is the same and the migration ofthe pigments towards the photographic rec- 0rd based upon similarphenomena.

After having described to the best of my knowledge the new materlal Iwish to be understood that the present disclosure isv for the purpose ofillustration only and that my invention includes any equivalentsoryariations which -fall within the scope of the appended claims.

I claim: V

1. In a two sided dyeing device susceptibleoi' being wetted forthepurpose of simultaneously coloring by' contact two separate,dye-receptive photographic records, or to produce a color, picture inthe same device by discharging the negative values from both sides, thecombination of a sheet-like transparent support and on each side of saidsupport one insensitive to light continuous coating of substantiallyplain gelatine carrying in dry condition and evenly distributed actuallysoluble orange dye matter on one side and, on the other side, actuallysoluble bluegreen dye matter; said dye matter 01' complementary colortransmissions, said dye matter pertaining to the kind of migratorypigments known to wander'from a film of damp gelatine into another, saiddye-carrying coatings each having one face towards the respective sideof the support and the other face exposed to the air, whereby it ispossible to secure a direct contact between the dye carrying coatingsand separate dye-receptive photographic records.

2. In a dyeing device susceptible of being wetted for the purpose ofcoloring by contact separate dye-{receptive photographic records, the

combination of asheet-like support and onaeach. side oisaidsupport onecontinuous, insensitive to lightmcoating :formed by absorbent colloidalbody insoluble inplain water at normal-temperature; said. colloidal bodyin both coatings carrying in dry condition and evenly distributedactually solubledye matter, said dye. matter pertaining tothejkind ofmigratory colors known to wander iroma film ordamp gelatine-into another, each of. said dye-carryingcoatings having one face towards. therespective. side of: thesupport and thejother iaceqexposed to the air. i

3. Ill-18 two sided device susceptible of being...

wetted for .thepurpose-of coloringby contact two separate dye-receptivephotographic records or to produce in the same device a color picture'bydischarging the negative values from both sides, the combination of asheet-like support having on one side two continuous insensi tive tolight and superposed layers of different thickness respectivelyformeduby absorbent colsitive to light and superposed layers ofabsorbent colloidal bejdies insoluble in water at normal temperature,said layers; having different, thickness and carrying in dry conditiondye matter oLdiiierent color for each-layer, the color. in one of thelayers corresponding to a spectral hue and the kind of migratorydyestuffs known to wander. from a film of damp gelatineinto another..;

6. In a two sided coloring device susceptible of being wetted for thepurpose of coloring by contact two separate fire-receptive photographicrecords representing complementary color values,

or to produce a color picture in the same device by discharging thenegative values from both sides, the combination of a transparentsupport and a plurality of coatings insensitive to light loidalbodiesinsoluble in water at normal temperature, said layers carryingincorporated in their colloidal body and in dry condition dye mattersusceptible of providing a different color in the respective layer, thecolor provided in one of the layers corresponding to a spectral hue andin the other layerto a second hue which when combined with the first huein different proportions will reproduce a succession of colors belongingto oneend-half of the spectrum; said support having on the other side athird single layer also insensitive to light and formed by a colloidalbody ca rying in dry condition dye matter of a transmissioncomplementary to the transmission of the first pair of layers, said dyematter pertaining to thekind of migratory dyestuffs known to wander froma film of damp gelatine into another.

4. In a two sided device susceptible of being wetted {or the purpose ofcoloring by contact two separate,dye-receptive photographic records, orto produce a color picture in thesame device by discharging the negativevalues from both sides, the combination of a sheet-like support and onone side of said support two continuous'insensitive to light andsuperposed layers of dinerent thickness respectively formed by absorbentcolloidal bodies insoluble in water at normal temperature, said layerscarrying incorporated in the corresponding'colloidal body and in drycondition dyed matter of difierent color for each having on the otherside two other similar layers also of different thickness andlnsensitiveto light, said secondlayers respectively carrying dye matter of adiflerent color for each layer, said dyelmatter in both of the layerspertaining to the kind of migratory dyestuffs known to wander from afilm of damp gelatine into another, the colors in the second pair oflayers complementary to the colors in the first pair of layers.

5. In a dyeing device susceptible of being wetted for the purpose ofsimultaneously coloring by contactwith two different colors,respectively, the lighter and heavier tones of an independentdye-receptive photographic record, or

to produce in the same device a duo coloredpicture by discharging thenegative values, the com distributed on both sides of said support, thecoatings .on one side carrying in dry condition soluble coloring matterdiiierent for each layer and respectively corresponding to colorsbelonging to one end-half of the spectrum, and the rest of the layers onthe other side also carrying in dry condition soluble dye mattercorresponding to at least one color of the other end-half of thespectrum, the colors on one side of the support of a combinedtransmission complementary to the transmission of the rest of the layerson the other side; each of said layers being continuous,

. formed by absorbent colloidal bodies insoluble in water at normaltemperature, and having the respective dye matter evenly distributed foran equal transmission in its whole area; said dye matter in all of thelayers pertaining to the kind of migratory dyestuffs known to wanderfrom a film of damp gelatine into another.

7. For use in the pigmenting of photographic records, a small amount ofa coloring bath, sufficient to cover an area to be pigmented, saidcoloring bath. including dye-matter and also colloidal matter known toproduce retarding action and even deposition .of pigments, saidcolloidal matter of the type which sets. in a jelly and is knownto swellwithout dissolving in water at normal temperature, said coloring bathalso containing dyeing-assisting matter known to control the solubilityof dye-matter and the rate of deposition of pigments," saiddyeing-assisting mattercorresponding to the class of dye-matter in thebath, said small amount of bath extended. on a supporting sheet-likeelement and dried, the surface or the supporting element correspondingto the area to be pigmented.

8. A dry, insensitive to light sheet-like element,

having in combination a support, and a dry coating of a permeable jellysetting colloid on said support, said colloid carrying in dry statesolid components of a coloring bath including dye matter anddyeing-assisting matter.

9. A dry, insensitive to light, sheet-like element including a permeablelayer or material insoluble in water at normal temperature, said layercarrying in dry state solid components of a coloring bath including dyematter and'dyeingassisting matter.

10. For use in the pigmenting of photographic records with economy,evenness and constant re-v suits, a dyeing device including a sheet-likesupport carrying in dry state a layer insensitive to light and havingone-oi its sides exposed to the bination oi ssupport and two continuousinsen-- air, said layer including dye matter and. also colloidal matterknown to produce retarding action and even deposition of pigments, thecolloidal matter unmordanted to said dye matter and susceptible oiabsorbing cold water without dissolving: said dye-matter completely andreadily soluble in water, the dye-matter further pertaining to the groupof migratory colors known to wander by contact from a layer of dampcolloid into another, said dye-matter chosen from thegroup ofdyestufls-which do not bleed in an acidified water solution, therelative conditions 01.. both the soluble dye-matter and the unmordantedcolloidal-matter causing the first to remain in the second in a freestate.

11. In a dyeing device susceptible oi being wetted for the purpose ofcoloring by contact a separate dye-receptive photographic record, or toproduce a picture in-the samedevice by discharging the negativevalues,the combination of a sheet-like support and a coating insensitive tolight on said support. this coating formed by absorbent matter insolublein plain water at normal temperature, said coating carrying in drycondition and evenly distributed readily soluble dye-matter, saidabsorbent matter unmordanted and without natural aiilnity for saiddye-matter,

said-coating having one'iace: towards the. support and the other exposedto the air.

' I". G. YANES.

